MODFLOW-2000, the U.S. Geological Survey Modular Ground-Water Model--Documentation of the SEAWAT-2000 Version with the Variable-Density Flow Process (VDF) and the Integrated MT3DMS Transport Process (IMT)

Langevin, Christian D.; Shoemaker, W. Barclay; Guo, Weixing

doi:10.3133/ofr03426

Cited by 180 publications

(178 citation statements)

References 18 publications

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“…e.g. the possible presence of small-scale heterogeneities in the rock that plays an important role in determining the hydraulic properties of the aquifers are too small to be taken into account by the modelling tools is a one grey area to search for answer Langevin, 2002 andLangevin et al, 2003) [18,19].…”

Section: Interpretation Of Simulation Resultsmentioning

confidence: 99%

Sea -Water Intrusion Studies For Coastal Aquifers: Some Points To Ponder

Soni¹

2012

TOHYDJ

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Abstract:Researchers all over the world have contributed various scientific studies to understand coastal aquifers characteristics and to study sea water intrusions phenomenon. While evaluating the impact of sea water on ground water system near the coast some pertinent points haunt the scientific community. In this technical contribution authors has raised some burning issues and points. Though, such issues and dilemmas were emerged in the analysis and discussions in past but the error and its magnitude, reliability of analyzed data, volume and source of authenticity of input field data, practical acceptance of solutions suggested etc. are some points that need introspection. Precise and better scientific analysis and solutions may be thought for future research directions and focus can be made on some of the points and issues raised. Based on interdisciplinary approaches accuracy in "evaluation plan and procedure" can be achieved scientifically and the challenges of uncertainty of sea-water intrusion assessment can be dealt in totality. Predictions required should be done in a realistic timeframe in respect of any particular geological domain, country or specific area. In brief, this original and must to read article encompasses technical material for the entire scientific community.

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Section: Interpretation Of Simulation Resultsmentioning

confidence: 99%

Sea -Water Intrusion Studies For Coastal Aquifers: Some Points To Ponder

Soni¹

2012

TOHYDJ

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“…. For a combined variable-density flow and solute-transport simulation, fluid density is expected to be a role only of solute concentration; the effects of pressure and temperature on fluid density are ignored (Langevin et al 2003).…”

Section: Numerical Modelingmentioning

confidence: 99%

“…The SEAWAT code proposed by Guo and Bennett (1998a, b), to simulate groundwater flow and saltwater intrusion in the coastal environments. The present Seawat code (Bear 2005;Langevin et al 2003) utilizes the modified version of Modflow (McDonald and Harbaugh 1988) to solve the variable density, groundwater flow equation and MT3D (Zheng 1990) to solve the solute transport equation. To minimize the complexity and runtimes, the SEAWAT code uses one step lag between solution of flow and transport.…”

Section: Numerical Modelingmentioning

confidence: 99%

“…(Surinaidu et al 2014) used the SEAWAT modeling for saline water intrusion in Godavari delta region and projected the intrusion for the next 50 years. Numerous studies were put forth for saline water intrusion in different parts of the globe by (Guo and Langevin 2002;Langevin et al 2003;Bakker et al 2004;Guo and Bennett 1998a, b;Sindhu et al 2012). …”

Section: Introductionmentioning

confidence: 99%

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Modeling saline water intrusion in Nagapattinam coastal aquifers, Tamilnadu, India

Gopinath

Srinivasamoorthy

Saravanan

et al. 2015

Model. Earth Syst. Environ.

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Unexpected mistreatment of groundwater from coastal aquifers may possibly cause salt water intrusion in coastal aquifers. Coastal areas are mostly overpopulated with productive agricultural lands and expanded irrigated farming actions. Field and modeling studies were started to consider the special effects of possible seawater intrusion into the coastal aquifers. Groundwater levels were measured at 61 locations in Nagapattinam and Karaikal coastal region, identified flow direction pointing toward the coast with no major change in groundwater table. Groundwater samples were collected and analyzed for major ionic parameters, represented higher concentration of conductivity, total dissolved solids, sodium and chloride along the coastal parts of the study area. A computer package for the simulation of dimensional variable density groundwater flow, SEAWAT, has been used to model the seawater intrusion in the coastal aquifers of the study area. The model was stimulated to predict the amount of seawater incursion in the study area for a period of 50 years. The simulation results signify saline water intrusion mainly due to up coning of saline water owing to over drafting of groundwater.

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“…Additional details on the model design are given in Dausman and Langevin (2002;2005). The extent, rate, and lag time of saltwater intrusion were evaluated using SEAWAT-2000 (Langevin et al, 2003), an updated version of the SEAWAT computer program (Guo and Bennett, 1998;Guo and Langevin, 2002). For the sea-level rise scenarios evaluated here, initial conditions (heads and salinities) were specified using the results from a long-term simulation in which the model had reached steady-state flow and transport conditions.…”

Section: Model Design and Analysismentioning

confidence: 99%

Numerical Simulation of Saltwater Intrusion in Response to Sea-Level Rise

Langevin

Dausman

2005

Impacts of Global Climate Change

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A two-dimensional numerical model of variable-density groundwater flow and dispersive solute transport was used to predict the extent, rate, and lag time of saltwater intrusion in response to various sea-level rise scenarios. Three simulations were performed with varying rates of sea-level rise. For the first simulation, sea-level rise was specified at a rate of 0.9 mm/yr, which is the slowest rate of sea-level rise estimated by the Intergovernmental Panel on Climate Change (IPCC). After 100 years, the 250 mg/L chloride isochlor moved inland by about 40 m, and required an additional 8 years for the system to reach equilibrium. For the next simulation, sealevel rise was specified at 4.8 mm/yr, which is the central value of the IPCC estimate. For this moderate rate of sea-level rise, the 250 mg/L isochlor moved inland by about 740 m after 100 years, and required an additional 10 years for the system to reach equilibrium. For the fastest rate of sea-level rise estimated by IPCC (8.8 mm/yr), the 250 mg/L isochlor moved inland by about 1800 m after 100 years, and required more than 50 years to reach equilibrium.

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MODFLOW-2000, the U.S. Geological Survey Modular Ground-Water Model--Documentation of the SEAWAT-2000 Version with the Variable-Density Flow Process (VDF) and the Integrated MT3DMS Transport Process (IMT)

Cited by 180 publications

References 18 publications

Sea -Water Intrusion Studies For Coastal Aquifers: Some Points To Ponder

Sea -Water Intrusion Studies For Coastal Aquifers: Some Points To Ponder

Modeling saline water intrusion in Nagapattinam coastal aquifers, Tamilnadu, India

Numerical Simulation of Saltwater Intrusion in Response to Sea-Level Rise

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